Why are diamonds expensive?

pu1. Diamonds are produced when high pressure is given at high temperatures above 3,500 degrees Celsius, so underground under natural conditions, under 130 kilometers... Diamonds produced underground by surface activity sometimes come up, making it a rare metal

2017-11-20

OK

pu2. Diamonds are rare, but they are not as valuable as they are now. The reason why it is so expensive is because there is only one company in the world that actually supplies diamonds, so it is monopolizing it, so it is forced to raise the price. But they don't know how long they can sustain the price, so there's a high possibility that diamond prices will collapse

2017-11-20

OK